Assume running consumes 103 calories per mile. If you run 9-minute mile, what is your average output in watts, during a 1-hour run?

9 minutes ⇒ 1 mile

1 hour = 60 minutes

60 minutes ⇒ 60/9 mile = 6.667 miles

1 mile ⇒ 103 cal

6.667 miles ⇒ 6.667 (103) cal = 686.667 cal

1 cal ⇒ 4.184 joules

686.667 cal ⇒ 2873.0133 joules

Watts = joules/time in seconds

60 minutes = 3600 seconds

W = 2873.0133/3600 ≈ 0.79805925 (round as needed)